安全组中预测用户名的代码怎么表示啊？

安全组中预测用户名的代码表示为

public static void main(final String!l args)《
try {
Systen.setSecurityManagerinew Securityhanageri): String username …"harry :
char[] passward … new charllH's", 'e', "c', 'r', "e", "t'h
LoginContext context mnew LoginContextl name:"Loginl",new SimpleCallbackHandlerlusername, password)) context.loginll:
Systen.out.printlni"Authentication successful."): Subject subjectmcontext.getsubjecti): Systen.out.printin(subject="+ subject):